Method for exchanging information for establishing a path between two nodes of a communication network
a communication network and path technology, applied in the field of communication networks, can solve the problems of not being able to guarantee the switching time less than 50 ms, the interface may not be able to and the alternative path may not support the required cc packet transmission ra
Active Publication Date: 2016-10-04
ALCATEL LUCENT SAS
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- Description
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- Application Information
AI Technical Summary
Benefits of technology
The invention provides a method for exchanging information to establish a path between two nodes in a communication network, such as an MPLS or GMPLS network. The method allows for non-tentative determination of the path and ensures monitoring of the path at a required packet transmission rate. This overcomes the drawbacks of previous methods and improves network efficiency.
Problems solved by technology
Typically if the monitoring function has a hardware implementation, the interface shall be able to support the required CC packet transmission rate, while if the monitoring function has a software implementation the interface may not be able to support the required CC packet transmission rate.
In this case, if a PRC mechanism is implemented for protecting the path after detection of a failure, a switching time less than 50 ms may not be guaranteed.
However, disadvantageously, this computation does not guarantee that the alternative path supports the required CC packets transmission rate.
Method used
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Embodiment Construction
[0058]FIG. 1 shows a communication network CN according to an embodiment of the present invention. The communication network CN is preferably a packet-switched network. More preferably, the communication network CN is a Multi-Protocol Label Switched (MPLS) network or a Multi-Protocol Label Switched-Transport profile (MPLS-TP) network, or a Generalized Multi-Protocol Label Switched (GMPLS). The communication network CN preferably supports traffic engineering (TE) functions.
[0059]The communication network CN comprises a number of nodes. The communication network CN of FIG. 1 comprises, by way of non limiting example, six nodes A, B, C, D, E and F. The nodes A, B, C, D, E, F of the communication network CN are connected by means of links. The links connecting the nodes A, B, C, D, E, F in FIG. 1 may be physical links (e.g. optical fibers) and / or logical links such as TE links. A logical, or TE, link between two nodes of the communication network CN may comprise a bundle of two or more ...
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An exemplary method and apparatus are provided for exchanging information for establishing a path between a first node and a second node of a communication network. The first node and the second node are adapted to send continuity check messages to monitor the established path. The technique includes generating, at the first node and at the second node, at least one link state message according to a routing protocol; inserting continuity check link state information into the at least one link state message; and exchanging between the first node and the second node, the link state messages for computing the path. The continuity check link state information are indicative of at least one rate of transmission of the continuity check messages supported by the first node and the second node.
Description
TECHNICAL FIELD[0001]The present invention generally relates to the field of communication networks. More in particular, the present invention relates to a method for exchanging information for establishing a path between two nodes of a communication network (in particular, but not exclusively, an MPLS network or an MPLS-TP network or a GMPLS network).BACKGROUND ART[0002]As known, current communication networks, such as IP (internet Protocol) networks, make use of the Multi-Protocol Label Switching (MPLS) for carrying data traffic flows between the nodes of the network. Data traffic flows are made of packets that are generated at a source node. According to the MPLS, each packet is associated to a “label”. The packets are then routed towards a destination node on the basis of their labels.[0003]In particular, the path followed by a packet from a source node to a destination node within a MPLS network is called a Label Switched Path (LSP). It is determined by the MPLS control plane o...
Claims
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IPC IPC(8): H04L12/26H04L12/751H04L12/913H04L45/02H04L47/724
CPCH04L43/10H04L45/026H04L47/724H04L41/046H04L41/0806H04L43/103
Inventor GRANDI, PIETRO VITTORIOBUSI, ITALOBELOTTI, SERGIO
Owner ALCATEL LUCENT SAS